Support superscript small q (#59544)

Co-authored-by: Steven G. Johnson <[email protected]>

Author: eschnett

stdlib/REPL/src/latex_symbols.jl

@@ -191,6 +191,7 @@ const latex_symbols = Dict(
     "\\^n" => "ⁿ",
     "\\^o" => "ᵒ",
     "\\^p" => "ᵖ",
+    "\\^q" => "𐞥",
     "\\^r" => "ʳ",
     "\\^s" => "ˢ",
     "\\^t" => "ᵗ",

stdlib/REPL/test/replcompletions.jl

@@ -1522,7 +1522,8 @@ end
     @test "⁽¹²³⁾ⁿ" in test_complete("\\^(123)n")[1]
     @test "ⁿ" in test_complete("\\^n")[1]
     @test "ᵞ" in test_complete("\\^gamma")[1]
-    @test isempty(test_complete("\\^(123)nq")[1])
+    @test "⁽¹²³⁾ⁿ𐞥" in test_complete("\\^(123)nq")[1]
+    @test isempty(test_complete("\\^(123)nQ")[1])
     @test "₍₁₂₃₎ₙ" in test_complete("\\_(123)n")[1]
     @test "ₙ" in test_complete("\\_n")[1]
     @test "ᵧ" in test_complete("\\_gamma")[1]